1)13-5х=8-2x
-5x+2x=8-13
-3x=-5
x=3/5
2)5у+15=6у+17
-1y=2
y=-2
3)5х(3х-7)=9
15x^2-35x-9=0
4))3у-(5*у)=11
-2y=11
y=-5,5
5)18=11-(9а+2)
18-11+2=9a
9=9a
a=1
1)13-5х=8-2x
-5x+2x=8-13
-3x=-5
x=3/5
2)5у+15=6у+17
-1y=2
y=-2
3)5х(3х-7)=9
15x^2-35x-9=0
4))3у-(5*у)=11
-2y=11
y=-5,5
5)18=11-(9а+2)
18-11+2=9a
9=9a
a=1